646312151 has 16 divisors (see below), whose sum is σ = 698997600. Its totient is φ = 595584000.

The previous prime is 646312133. The next prime is 646312153. The reversal of 646312151 is 151213646.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646312151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646312153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311345 + ... + 313413.

It is an arithmetic number, because the mean of its divisors is an integer number (43687350).

Almost surely, 2^646312151 is an apocalyptic number.

646312151 is a deficient number, since it is larger than the sum of its proper divisors (52685449).

646312151 is a wasteful number, since it uses less digits than its factorization.

646312151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530.

The product of its digits is 4320, while the sum is 29.

The square root of 646312151 is about 25422.6700210658. The cubic root of 646312151 is about 864.5977619058.

Adding to 646312151 its reverse (151213646), we get a palindrome (797525797).

The spelling of 646312151 in words is "six hundred forty-six million, three hundred twelve thousand, one hundred fifty-one".